Somebody did the math in another thread. If I understood correct, if they use any seeding formula from the past 4 years they can't bump Nadal out. That doesn't mean they won't make up a new one an try, but they'll have to work for it.
Quite frankly, I don't think there is any reason to do it, but I don't have any respect for Wimbledon and expect them to do the wrong thing
As for the number 2 slot, I don't imagine they care where Hewitt or Roddick fall. It will depend on the Nadal-Math. Or the Henman-Math, if you prefer